QTR-Quadtone RIP

Hello,
I am using MIS UT7 inks in an Epson 4000. I am attempting to make some 
curves for this combination and my chosen paper. I find starting with 
the 2200 UT7 curves, that the Light Black ink is not used. I would like 
to use this ink (why let it not be used?) since I feel using the larger 
number of inks might make a better tone. For example, the warm tone 
curves only use Black and the two tones of warm grey (Cyan/Light Cyan 
positions in the 4000). Only three inks being used. Why would the Light 
Black ink not also be in play? I am trying to do this without a 
spectrometer - and scanning/PS color sampler tool is a difficult way to 
go. 

Has anyone created a curve using the Light Black that I could use as a 
baseline for some creative curve making? 

thank you,
Ken Smith

>
I would like to use this ink (why let it not be used?) since I feel 
using the larger number of inks might make a better tone.
>

Ken, you don't need LK to produce good QTR curve with UT7. This set was 
designed for printer driver, which uses LK, but when you mix inks in 
QTR, it is hard to linearize with this ink. This is why there is no 
curve that uses this ink. I am using light light gray instead.

Good luck,
Sergei